Having read the original post again, we have to ask macianca WHAT SITE the Kindle Fire was bought from. I'm a UK citizen, but I know that I can't buy Kindle content from the UK site, for my Amazon US-purchased K3. Indeed, the US site sells to the rest of the World, while the UK site only serves the UK itself (and perhaps some other European countries).
And maybe there is another issue here. At the time when the Fire was launched, it wasn't possible for Amazon US to send it to countries in THIS region. I haven't checked recently. Perhaps that is still true for some countries. Perhaps that is the real problem?:
Regards,
Not the Brightest
on the Block